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llc,rnun Ac Helen ,Marina- First Quarter 1999 Groundwater Monitoring <br /> Apnl l4 1999 <br /> Page -4- <br /> TABLE 2 <br /> Laboratory Analytical Results <br /> Groundwater Samples (Marcie 26, 1999) <br />' Oxygenates/Additives <br /> B T E X TPH-G <br /> MTBE Ethanol tert_ DIPE ETBE TAME <br /> Butanol <br /> Detection 03 03 03 06 005 1 0 1 0 10 1 0 1 0 1 0 <br /> I tmits µg/I IM µg/1 µg/i mg/1 µg/1 µg/1 µg/1 µg/1 l g%l µg/1 <br /> Analytical Method 602 602 602 602 5030 8260 8260 8260 8260 8260 8260 <br /> Sample 113 <br />' 1432-MW1-3126199 ND ND ND ND I ND ND ND ND ND ND ND <br /> 1432-MW2-3126199 ND* ND* ND* ND* ND* 130,000 ND* ND* ND* ND* <br /> 1432-MW3-3126199 ND* ND* ND* ND* ND* 7,200 ND ND ND ND ND <br /> 1432-MW�1-3/26199 12 ND ND 12 007 ND ND ND ND ND ND <br /> IUnit C onvc rstons Analyut,al <br /> µg/l parts per billion (ppb) B I FX Nen/enc toluene ethyl ben7Lne and xylene. <br /> mg/1 parts per million(ppm) TPHAt=total petrolcum hydrocarbons quantified as gasoline <br /> ND=none detected it or above.laboratory reported det4ction limit <br /> MTBE=methyl tort-butyl ether <br /> tete Butanol=tertiary-butanol <br />' DIPE di-isopropyl cthes <br /> ETBr =ethyi tLrtiary-butyi ether <br /> TAME=tLrtiary-amyl methyl ether <br /> ND=not detected at or above the laboratory reported detection limit <br />' ND* =not detected at or above a raised laboratory reported detection limit See laboratory report <br /> sheets for detection limits <br /> I 3 4 GROUNDWATER ELEVATION CONTOURS <br /> Groundwater elevation measurements collected at the site on March 26, 1999, indicated that the average depth to <br /> groundwater was approximately 5 5 feet below the monitor well and surface water station measuring points The <br /> groundwater elevations for the wells and the surface water elevations are shown in Figure 4,Appendix A Figure <br /> 4 shows the estimated groundwater elevation contours on March 26, 1999 The contours indicate a very steep <br /> groundwater gradient towards the island drainage channel <br /> r <br /> i <br /> Itte� CONDOR <br />